JP5000617B2 - Piping measuring instrument mounting structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a pipe measuring instrument mounting structure, and in particular, to a pipe measuring instrument that can be easily and accurately welded to a connecting pipe member even if a short pipe portion caused by burring is thin and short. Concerning structure.

2. Description of the Related Art Conventionally, a pipe measuring instrument mounting structure is known in which a branch pipe is provided in the middle of a pipe, and a part of a measuring instrument such as a pressure gauge is inserted into the branch pipe (see Patent Document 1).
The mounting structure of this measuring instrument is a burring process in which a short pipe part is erected outward from the peripheral surface of the pipe, a connecting pipe member is welded to the short pipe part, and a sensor holder of the measuring instrument is attached to the connecting pipe member. The flange of the sensor holder and the connecting pipe member are fixed with a clamp.

By the way, such a pipe measuring instrument mounting structure needs to weld a connecting pipe member to a short pipe portion formed as a branch pipe, but since the short pipe portion is plastically processed by burring, the pipe There is a limit to the rise from the main body and the wall thickness. To weld this thin and short short pipe section and the connecting pipe member, a highly skilled technique is required.
JP 2004-340739 A

  In view of the problems of the conventional piping instrument mounting structure described above, the present invention can easily and accurately connect a pipe member for connection even if the short pipe portion standing outward from the peripheral surface of the pipe is thin and short. An object is to provide a pipe measuring instrument mounting structure that can be welded.

  In order to achieve the above-described object, the pipe measuring instrument mounting structure of the present invention has a short pipe portion standing outward from the peripheral surface of the pipe, and a welding pipe member is welded to the short pipe portion. In a pipe measuring instrument mounting structure that connects a measuring instrument to a pipe member, a protrusion is formed on the inner side of the short pipe part side end of the connecting pipe member so as to cover the joint part with the short pipe part. The short pipe part and the connecting pipe member are welded by electron beam welding.

In this case, the said protrusion can be made into the seat of the seal part of the sensor holder inserted in the pipe member for connection holding a measuring device .

Furthermore, the said protrusion can be formed in the taper shape from which the short pipe part side becomes a small diameter.

  According to the pipe measuring instrument mounting structure of the present invention, the short pipe portion is erected outward from the peripheral surface of the pipe, the connecting pipe member is welded to the short pipe section, and the measuring pipe is connected to the measuring pipe member. In the measuring instrument mounting structure for connecting pipes, a ridge is formed inside the short pipe portion side end of the connecting pipe member so as to cover the joint portion with the short pipe portion, and the short pipe portion Since the connecting pipe member is welded by electron beam welding, the ridge formed inside the short pipe portion side end of the connecting pipe member acts as a backing material for welding, and the short pipe portion Even if it is thin and short, it is possible to perform welding with low heat input, low distortion, and no defects such as cracks, whereby the connecting pipe member can be easily and accurately welded to the short pipe portion.

Moreover, the structure of a connection pipe member can be simplified by making the said protrusion into a seat of the seal part of the sensor holder inserted in the connection pipe member holding a measuring device .

Further, by the protruding short pipe portion is formed in a tapered shape whose diameter, pressed against the tapered portion to the sealing portion of the sensor holder, thereby improving the sealing property.

  Embodiments of a pipe measuring instrument mounting structure according to the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of a pipe measuring instrument mounting structure according to the present invention.
The pipe measuring instrument mounting structure is constructed such that the short pipe portion 2 is erected outward from the peripheral surface of the pipe 1 by burring, and the connecting pipe member 3 is welded to the short pipe portion 2. The sensor holder 4 of the measuring instrument S is inserted into the sensor holder 4, and the sensor holder 4 and the connecting pipe member 3 are fixed.
The pipe measuring instrument mounting structure has a protrusion 31 that is a seat for the seal part 41 of the sensor holder 4 on the inner side of the short pipe part side end of the connecting pipe member 3, and a protrusion. The strip 31 is extended so as to cover the joint portion 5 with the short pipe portion 2 from the inner peripheral side, and is used as a welding backing material.

In this embodiment, the pipe 1 is made of a stainless steel pipe member. After the connecting pipe member 3 is welded to the short pipe portion 2 by electron beam welding, the ferrule flanges 11 are joined to both ends by, for example, TIG welding. ing.
In the electron beam welding, since the electron beam is irradiated from the end of the pipe 1 to the outer peripheral surface, it is necessary to process the ferrule flanges 11 at both ends.
Electron beam welding has a wide variety of steel grades, can be widely used for various types of commercially available steel, and can perform high-precision welding with low heat input, low distortion, and no defects such as cracks. .

The short pipe portion 2 is provided with a processing hole (not shown) on the side wall of the pipe 1, burring the opening edge of the processing hole, raising the burring portion, and cutting the upper end of the burring portion. Therefore, it is formed in a very short cylindrical shape with a protruding dimension of about several mm.
In this plastic working by burring, such a branch pipe can be manufactured at low cost with high accuracy.

In this embodiment, the connecting pipe member 3 is made of a stainless steel member. The connecting pipe member 3 has a flange 32 at one end and is fixed to the short pipe portion 2 by welding.
As shown in FIG. 2, a protrusion 31 serving as a seat for the seal portion 41 of the sensor holder 4 is provided around the inner end of the short tube portion side end of the connecting pipe member 3. However, it extends so that the junction part 5 with the short pipe part 2 may be covered, and it is set as the welding backing material.
The ridge 31 is formed in a taper shape with a small diameter on the short tube portion side, abuts against a seal portion 41 made of an O-ring of the sensor holder 4, and tightens the flanges 32 and 42 with the clamp 6, whereby the taper portion is formed. Sealing performance is improved by being pressed against the seal portion 41.
The length L1 of the protrusion 31 in the axial direction is 4 to 5 mm (about 4.5 mm in this embodiment), and the length L2 extending beyond the joint portion 5 is 1 to 2 mm (about 1. mm in this embodiment). 5 mm), the protrusion height T is about 3 mm, and the taper is about 15-30 °.
As shown in FIG. 2 (a), the welded portion 7 by the electron beam is formed using the protrusion 31 as a backing material. Therefore, as a high-precision welding without defects such as cracks, the connecting tube is connected to the short tube portion 2. The member 3 can be joined.

As shown in FIG. 1, the main body of the measuring instrument S is fixed to the sensor holder 4 by screws, and is fixed to the connecting pipe member 3 via the sensor holder 4.
A flange 42 is formed at a predetermined position in the sensor holder 4. By fixing the flange 42 of the sensor holder 4 and the flange 32 of the connecting pipe member 3 with the clamp 6, the sensor holder 4 has its seal portion. The pipe 41 is fixed to the connecting pipe member 3 while being pressed against the ridge 31.
At this time, the diaphragm 43 of the sensor holder 4 is substantially flush with the inner surface of the pipe 1, and does not impair the fluidity of the pipe 1 and improves the cleaning performance.

  As the measuring instrument S, in addition to the pressure sensor S1 and the pressure gauge S2 shown in FIGS. 1 to 3, as shown in FIG. 4, two short pipe portions 2 and connecting pipe members 3 are provided, A temperature sensor S3 may be provided together with the gauge S2.

  Thus, the pipe measuring instrument mounting structure of the present embodiment is such that the short pipe portion 2 is erected from the peripheral surface of the pipe 1 to the outside, and the connecting pipe member 3 is welded to the short pipe portion 2. 3, a pipe measuring instrument mounting structure for connecting the sensor holder 4 of the measuring instrument S to the inner side of the short pipe part side end of the connecting pipe member 3, a protrusion serving as a seat for the seal part 41 of the sensor holder 4. Since the ridge 31 is provided so as to cover the joint portion 5 with the short pipe portion 2 while surrounding the ridge 31, the ridge 31 formed as a seat for the seal portion 41 of the sensor holder 4, It can be used as a backing material for welding, and can thereby be easily and accurately welded to the connecting pipe member 3 even if the short pipe portion 2 is thin and short.

  In addition, by forming the protrusion 31 in a tapered shape with the short pipe portion having a small diameter, the tapered portion can be pressed against the seal portion 41 of the sensor holder 4 to improve the sealing performance.

  Further, by welding the short pipe portion 2 and the connecting pipe member 3 by electron beam welding, it is possible to perform high-precision welding with low heat input, low distortion, and no defects such as cracks.

  As mentioned above, although the attachment structure of the measuring instrument of the piping of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning, it is appropriate. Its configuration can be changed.

  The pipe measuring instrument mounting structure of the present invention has the characteristic that it can be easily and accurately welded to the connecting pipe member even if the short pipe portion caused by the burring process is thin and short. As a mounting structure of a measuring instrument in which a branch-shaped holding part is provided in the pipe, it can be used widely and suitably.

It is sectional drawing which shows 1st Example of the attachment structure of the measuring device of piping of this invention. The connection pipe member and piping of the same Example are shown, (a) is an expanded sectional view which shows a connection pipe member and a short pipe part, (b) is sectional drawing which shows a connection pipe member and piping. (A) is sectional drawing which shows a sensor holder, (b) is sectional drawing which shows the pipe member for a connection. It is sectional drawing which shows 2nd Example of the attachment structure of the measuring device of the piping of this invention.

DESCRIPTION OF SYMBOLS 1 Piping 11 Ferrule flange 2 Short pipe part 3 Connecting pipe member 31 Projection 32 Flange 4 Sensor holder 41 Seal part 42 Flange 43 Diaphragm 5 Joint part 6 Clamp 7 Welded part by electron beam S Measuring instrument

Claims (3)

  In a pipe measuring instrument mounting structure in which a short pipe part is erected outward from the peripheral surface of the pipe, a connecting pipe member is welded to the short pipe part, and a measuring instrument is connected to the connecting pipe member. A protrusion is formed on the inner side of the short tube portion side end of the tube member so as to cover the joint portion with the short tube portion, and the short tube portion and the connecting tube member are welded by electron beam welding. A piping measuring instrument mounting structure characterized by: 2. The pipe measuring instrument mounting structure according to claim 1, wherein the protrusion is a seat for a seal portion of a sensor holder inserted in a connecting pipe member that holds the measuring instrument. The pipe measuring instrument mounting structure according to claim 1 or 2, wherein the protrusion is formed in a taper shape having a small diameter on the short pipe side.

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